Physically, Fig. REF  says the following: In Haff's
case, the dynamics of the systems becomes slower as time advances,
making the dissipation slower, and so on, as long as the system is
homogeneous [1]}. In the presence of non-contact forces, the
system can have at least two different regimes: at the beginning, the
thermal energy is larger than the repulsive/attractive energy, its
effect being negligible. As the system cools down, the
repulsive/attractive barrier will start to be felt, and the cooling
will be consequently modified. For the attractive force the prediction
says that once the particles start to feel the attraction they will
dissipate energy faster but nevertheless will retain the power law of
the dissipation and keep the homogeneity.
